«Estrogen, or oestrogen, is the primary femalesex hormone. It is responsible for the development and regulation of the female reproductive system and secondary sex characteristics. There are three major endogenous estrogens in females that have estrogenic hormonal activity: estrone, estradiol, and estriol. The estranesteroidestradiol is the most potent and prevalent of these.

Estrogens are synthesized in all vertebrates[1] as well as some insects.[2] Their presence in both vertebrates and insects suggests that estrogenic sex hormone have an ancient evolutionary history. The three major naturally occurring forms of estrogen in females are estrone (E1), estradiol (E2), and estriol (E3). Another type of estrogen called estetrol (E4) is produced only during pregnancy. Quantitatively, estrogens circulate at lower levels than androgens in both men and women.[3] While estrogen levels are significantly lower in males compared to females, estrogens nevertheless also have important physiological roles in males.[4]

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Modified: 10 months ago on Jan 8, 2019
personAlex Inside 24 lvl added it 10 months ago on Jan 8, 2019.